QT QCoreApplication :: 간부() 우분투에 충돌 12.04

Question

내가 QT 소켓에 신호 슬롯이있는 시스템 응용 프로그램을 개발하고, 우분투

void Receiver::startServer() 
{ 
.... 
connect(udpSocket, SIGNAL(readyRead()), this, SLOT(receiveFunc())); 
} 

void Receiver::receiveFunc() 
{ 


emit receiveForwarder(); 
{ 


Handler::start() 
{ 
receiver= new Receiver(); 
thread=new QThread() 
receiver->moveToThread(thread); 
receiver->startServer(); 

connect(receiver, SIGNAL(receiveForwarder()), this, SLOT(processTexts())); 
} 

Handler::processTexts() 
{ 



//emit another signal that is in another thread 
} 

나는 스레드에 대한 슬롯 중 하나 인 processTexts 기능이 또한 다른 스레드에 신호를 내 보냅니다. Handler에서 두 번째 방사를 생략하면 문제는 해결되지 않지만 나중에 프로그램이 충돌합니다. 그러나 그것은 사라지지 않습니다. 1 ~ 2 분 후에 깨집니다. 프로그램은 UDP 소켓에서 오는 텍스트를 처리합니다. 다른 QTcpSocket을 통해 다른 프로그램으로 보냅니다.

충돌 서명은 다음과 같습니다

0[bt:0]/application/collector/main.cpp::exceptionHandler(int)::30 
./collector(_Z16exceptionHandleri+0x56)[0x422156] 
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0)[0x7fbf348f54c0] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(+0x1a9b24)[0x7fbf35558b24] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_check+0x183)[0x7fbf33db1a33] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x47f96)[0x7fbf33db1f96] 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x34)[0x7fbf33db2124] 
/usr/lib/x86_64-linugnu-libQtCore.so.4(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEven tsFlagEE+0xd6)[0x7fbf35559426] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN10QEventLoop13processEventsE6QFlagsINS_17ProcessEventsFlagEE+0x32)  [0x7fbf35528c82] 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0xf7)  [0x7fbf35528ed7] 
    /usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN16QCoreApplication4execEv+0x87)[0x7fbf3552df67] 
    ./collector(main+0x216)[0x4234c6] 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7fbf348e076d] 

나는 Valgrind의 그것을 분석하고 그것을 말한다 :

==31981== Conditional jump or move depends on uninitialised value(s) 
==31981== at 0x556AB14: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== 
==31981== Invalid read of size 2 
==31981== at 0x556AB45: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== Address 0xa8bf0c6 is 6 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 

==31981== 
==31981== Invalid read of size 2 
==31981== at 0x556AB4D: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 
==31981== Address 0xa8bf0c4 is 4 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 

==31981== 
==31981== Thread 2: 
==31981== Invalid write of size 2 
==31981== at 0x6C281FA: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C291D1: g_source_add_poll (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B7A9: QEventDispatcherGlib::registerSocketNotifier(QSocketNotifier*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x5145E59: QUdpSocket::readDatagram(char*, long long, QHostAddress*, unsigned short*) (in /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4.8.1) 
==31981== by 0x4205F1: LogReceiver::receiveLog() (udpSocket.cpp:52) 
==31981== by 0x42B630: LogReceiver::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (moc_udpSocket.cpp:54) 
==31981== by 0x5555445: QObject::event(QEvent*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553BE9B: QCoreApplication::notifyInternal(QObject*, QEvent*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FC69: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x556AF92: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AC99: g_main_context_dispatch (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B05F: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== Address 0xa8bf0c6 is 6 bytes inside a block of size 16 free'd 
==31981== at 0x4C2A4BC: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) 
==31981== by 0x556AB44: ??? (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x6C2AA32: g_main_context_check (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2AF95: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x6C2B123: g_main_context_iteration (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.1) 
==31981== by 0x556B3BE: QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AC81: QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553AED6: QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x553FF66: QCoreApplication::exec() (in /usr/lib/x86_64-linux-gnu/libQtCore.so.4.8.1) 
==31981== by 0x4234C5: main (main.cpp:170) 

내가 프로그램을 분석하고 그것이 인 경우 내가 모르는 내 모든 버그를 제거 Qt 버그 또는 우분투 버그 또는 GCC 또는 내 잘못.

게다가 아무도 초당 20 개 이상의 이벤트가있는 시스템 응용 프로그램을 사용해 본지 알고 싶었습니다. 잠시 후 충돌이 발생합니다.

감사합니다.

Answer 1

SocketNotifier 구현은 스레드로부터 안전하지 않습니다. 즉, 다른 스레드에서 제어 할 수 없습니다. 개체의 모든 구성원이 그가 스레드로 이동하는 경우

void QEventDispatcherGlib::unregisterSocketNotifier(QSocketNotifier *notifier) 
{ 
    Q_ASSERT(notifier); 
#ifndef QT_NO_DEBUG 
    int sockfd = notifier->socket(); 
    if (sockfd < 0) { 
     qWarning("QSocketNotifier: Internal error"); 
     return; 
    } else if (notifier->thread() != thread() 
       || thread() != QThread::currentThread()) { 
     qWarning("QSocketNotifier: socket notifiers cannot be disabled from another thread"); 
     return; 
    } 
#endif 
//.... 
} 

가 확인하시기 바랍니다의 자식으로 만들어집니다 당신은 Qt는이 QT_NO_DEBUG없이 컴파일 한 경우

당신은 당신이 다른 스레드에서 그것을 제어하는 ​​경고 메시지가 나타납니다 이 객체. 또는 QT_NO_DEBUG 스위치를 끄십시오.

BTW : 비슷한 문제로 고생했으며 충돌 한 시간이 몇 시간 후에 나타납니다.